zài / yī / shēng / zhǐ / dǎo / xià / fú / yòng / zhèn / dìng / jì / bù / néng / zì / xíng / zēng / jiā / jì / liàng

在医生指导下服用镇定剂，不能自行增加剂量。

Take tranquilizers under a doctor's guidance and do not increase the dosage on your own.